TruMotion is designed to hold the image on screen a fraction of the time it would normally be allotted in order to eliminate any possible blurriness resulting by image in motion sequence transition caused by inherent lagging attributed to LCD panel mechanism.
TruMotion 120Hz accomplishes aforementioned by inserting an artificially created interpolated image between previous and next based on algorithm calculating motion estimation & motion compensation.
TruMotion 240Hz achieves keeping image on screen ¼ of its allotted time by combining 120Hz interpolation and backlight scanning for an even cleaner, clearer and crisper image transistion. Some LG flat panel display models rely solely on backlight scanning to achieve 120Hz TruMotion at which point no adjustment whatsoever are made possible.
Movies are captured on celluloid at a rate of 24 images per second. When projected onto a big screen the low count of pictures flashing on screen account for the dreamy sensation we get of escaping reality. That is one of the prime objectives of filmmaking.
Video camcorders on the other hand capture scenes at a rate of 60 images per second for a more natural and realistically raw in-your-face footage. There is nothing artificial, dreamy or fantasized here.
Televisions display images whether in motion or static at a rate of 60 images per second (60 Hz). 3:2 pull-down process was developed to get a 24fps movie to play on television. It consists of playing odd frames twice and even frames three times: (12 x 2) + (12 x 3) = 60.
Most DVD movie titles are encoded at 480/60i whereas most Blu-ray movie titles are encoded 1080/24p. Best case scenario viewing Blu-ray movies is setting Blu-ray player video output to match that of the viewing video source.
Where it gets a bit more complicated involves rapid motion in the foreground and rapid motion in the background more specifically in opposite directions. Combination of both may require more processing memory than the television is capable of handling at which point TruMotion feature risks being more detrimental to picture reproduction by adding undesired video artifacts. Turning it completely off might be vest viable option at that point.
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